[Bug middle-end/15449] New: der_io.f90 failure apparently due to misoptimization

[Bug middle-end/15449] New: der_io.f90 failure apparently due to misoptimization

[tobi at gcc dot gnu dot org]

I have posted a very basic analysis of this problem here:
http://gcc.gnu.org/ml/gcc/2004-05/msg00781.html

After the nested function gets inlined, its result is lost.

I put this in the middle-end component, as this seems to be where the nastiness
happens.

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           Summary: der_io.f90 failure apparently due to misoptimization
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tobi at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15449

[Bug fortran/15449] [gfortran] der_io.f90 failure apparently due to misoptimization

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-05-15 00:50 -------
Actually I think this is a gfortran problem.

The issue I think is that the return statement does not contain a modify expression which is what :
  return __result_bar;

Confirmed.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
          Component|middle-end                  |fortran
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2004-05-15 00:50:11
               date|                            |
            Summary|der_io.f90 failure          |[gfortran] der_io.f90
                   |apparently due to           |failure apparently due to
                   |misoptimization             |misoptimization


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15449

[Bug fortran/15449] [gfortran] der_io.f90 failure apparently due to misoptimization

[tobi at gcc dot gnu dot org]

------- Additional Comments From tobi at gcc dot gnu dot org  2004-05-16 20:43 -------
(In reply to comment #1)
> Actually I think this is a gfortran problem.
> 
> The issue I think is that the return statement does not contain a modify
expression which is what :

I would be very grateful, if you could finish that sentence. You may remove
yourself from CC afterwards. :-)

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15449

[Bug tree-optimization/15449] [gfortran] der_io.f90 failure apparently due to misoptimization

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-05-16 20:50 -------
I looked again, and this is not what I thought it was.

The finish of the sentence is "what the tree inliner expects".  But I was wrong in the analysis.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|fortran                     |tree-optimization


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15449

[Bug tree-optimization/15449] [gfortran] der_io.f90 failure apparently due to misoptimization

[tobi at gcc dot gnu dot org]

------- Additional Comments From tobi at gcc dot gnu dot org  2004-05-16 20:55 -------
(In reply to comment #3)
> I looked again, and this is not what I thought it was.
> 
> The finish of the sentence is "what the tree inliner expects".  But I was
wrong in the analysis.

Too bad. Thanks.



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15449